Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015 Nicira, Inc. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of version 2 of the GNU General Public |
| 6 | * License as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/openvswitch.h> |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 16 | #include <linux/tcp.h> |
| 17 | #include <linux/udp.h> |
| 18 | #include <linux/sctp.h> |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 19 | #include <net/ip.h> |
| 20 | #include <net/netfilter/nf_conntrack_core.h> |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 21 | #include <net/netfilter/nf_conntrack_helper.h> |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 22 | #include <net/netfilter/nf_conntrack_labels.h> |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 23 | #include <net/netfilter/nf_conntrack_seqadj.h> |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 24 | #include <net/netfilter/nf_conntrack_zones.h> |
| 25 | #include <net/netfilter/ipv6/nf_defrag_ipv6.h> |
| 26 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 27 | #ifdef CONFIG_NF_NAT_NEEDED |
| 28 | #include <linux/netfilter/nf_nat.h> |
| 29 | #include <net/netfilter/nf_nat_core.h> |
| 30 | #include <net/netfilter/nf_nat_l3proto.h> |
| 31 | #endif |
| 32 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 33 | #include "datapath.h" |
| 34 | #include "conntrack.h" |
| 35 | #include "flow.h" |
| 36 | #include "flow_netlink.h" |
| 37 | |
| 38 | struct ovs_ct_len_tbl { |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 39 | int maxlen; |
| 40 | int minlen; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 41 | }; |
| 42 | |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 43 | /* Metadata mark for masked write to conntrack mark */ |
| 44 | struct md_mark { |
| 45 | u32 value; |
| 46 | u32 mask; |
| 47 | }; |
| 48 | |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 49 | /* Metadata label for masked write to conntrack label. */ |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 50 | struct md_labels { |
| 51 | struct ovs_key_ct_labels value; |
| 52 | struct ovs_key_ct_labels mask; |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 53 | }; |
| 54 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 55 | enum ovs_ct_nat { |
| 56 | OVS_CT_NAT = 1 << 0, /* NAT for committed connections only. */ |
| 57 | OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */ |
| 58 | OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */ |
| 59 | }; |
| 60 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 61 | /* Conntrack action context for execution. */ |
| 62 | struct ovs_conntrack_info { |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 63 | struct nf_conntrack_helper *helper; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 64 | struct nf_conntrack_zone zone; |
| 65 | struct nf_conn *ct; |
Joe Stringer | ab38a7b | 2015-10-06 11:00:01 -0700 | [diff] [blame] | 66 | u8 commit : 1; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 67 | u8 nat : 3; /* enum ovs_ct_nat */ |
Jarno Rajahalme | dd41d33 | 2017-02-09 11:22:00 -0800 | [diff] [blame] | 68 | u8 force : 1; |
Jarno Rajahalme | 1206455 | 2017-04-21 16:48:06 -0700 | [diff] [blame] | 69 | u8 have_eventmask : 1; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 70 | u16 family; |
Jarno Rajahalme | 1206455 | 2017-04-21 16:48:06 -0700 | [diff] [blame] | 71 | u32 eventmask; /* Mask of 1 << IPCT_*. */ |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 72 | struct md_mark mark; |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 73 | struct md_labels labels; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 74 | #ifdef CONFIG_NF_NAT_NEEDED |
| 75 | struct nf_nat_range range; /* Only present for SRC NAT and DST NAT. */ |
| 76 | #endif |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 77 | }; |
| 78 | |
Jarno Rajahalme | 09aa98a | 2017-02-09 11:21:58 -0800 | [diff] [blame] | 79 | static bool labels_nonzero(const struct ovs_key_ct_labels *labels); |
| 80 | |
Joe Stringer | 2f3ab9f | 2015-12-09 14:07:39 -0800 | [diff] [blame] | 81 | static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info); |
| 82 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 83 | static u16 key_to_nfproto(const struct sw_flow_key *key) |
| 84 | { |
| 85 | switch (ntohs(key->eth.type)) { |
| 86 | case ETH_P_IP: |
| 87 | return NFPROTO_IPV4; |
| 88 | case ETH_P_IPV6: |
| 89 | return NFPROTO_IPV6; |
| 90 | default: |
| 91 | return NFPROTO_UNSPEC; |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | /* Map SKB connection state into the values used by flow definition. */ |
| 96 | static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo) |
| 97 | { |
| 98 | u8 ct_state = OVS_CS_F_TRACKED; |
| 99 | |
| 100 | switch (ctinfo) { |
| 101 | case IP_CT_ESTABLISHED_REPLY: |
| 102 | case IP_CT_RELATED_REPLY: |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 103 | ct_state |= OVS_CS_F_REPLY_DIR; |
| 104 | break; |
| 105 | default: |
| 106 | break; |
| 107 | } |
| 108 | |
| 109 | switch (ctinfo) { |
| 110 | case IP_CT_ESTABLISHED: |
| 111 | case IP_CT_ESTABLISHED_REPLY: |
| 112 | ct_state |= OVS_CS_F_ESTABLISHED; |
| 113 | break; |
| 114 | case IP_CT_RELATED: |
| 115 | case IP_CT_RELATED_REPLY: |
| 116 | ct_state |= OVS_CS_F_RELATED; |
| 117 | break; |
| 118 | case IP_CT_NEW: |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 119 | ct_state |= OVS_CS_F_NEW; |
| 120 | break; |
| 121 | default: |
| 122 | break; |
| 123 | } |
| 124 | |
| 125 | return ct_state; |
| 126 | } |
| 127 | |
Joe Stringer | 0d5cdef | 2015-08-28 19:22:11 -0700 | [diff] [blame] | 128 | static u32 ovs_ct_get_mark(const struct nf_conn *ct) |
| 129 | { |
| 130 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) |
| 131 | return ct ? ct->mark : 0; |
| 132 | #else |
| 133 | return 0; |
| 134 | #endif |
| 135 | } |
| 136 | |
Jarno Rajahalme | b87cec3 | 2017-02-09 11:21:56 -0800 | [diff] [blame] | 137 | /* Guard against conntrack labels max size shrinking below 128 bits. */ |
| 138 | #if NF_CT_LABELS_MAX_SIZE < 16 |
| 139 | #error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes |
| 140 | #endif |
| 141 | |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 142 | static void ovs_ct_get_labels(const struct nf_conn *ct, |
| 143 | struct ovs_key_ct_labels *labels) |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 144 | { |
| 145 | struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL; |
| 146 | |
Jarno Rajahalme | b87cec3 | 2017-02-09 11:21:56 -0800 | [diff] [blame] | 147 | if (cl) |
| 148 | memcpy(labels, cl->bits, OVS_CT_LABELS_LEN); |
| 149 | else |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 150 | memset(labels, 0, OVS_CT_LABELS_LEN); |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 151 | } |
| 152 | |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 153 | static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key, |
| 154 | const struct nf_conntrack_tuple *orig, |
| 155 | u8 icmp_proto) |
| 156 | { |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 157 | key->ct_orig_proto = orig->dst.protonum; |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 158 | if (orig->dst.protonum == icmp_proto) { |
| 159 | key->ct.orig_tp.src = htons(orig->dst.u.icmp.type); |
| 160 | key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code); |
| 161 | } else { |
| 162 | key->ct.orig_tp.src = orig->src.u.all; |
| 163 | key->ct.orig_tp.dst = orig->dst.u.all; |
| 164 | } |
| 165 | } |
| 166 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 167 | static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state, |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 168 | const struct nf_conntrack_zone *zone, |
| 169 | const struct nf_conn *ct) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 170 | { |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 171 | key->ct_state = state; |
| 172 | key->ct_zone = zone->id; |
Joe Stringer | 0d5cdef | 2015-08-28 19:22:11 -0700 | [diff] [blame] | 173 | key->ct.mark = ovs_ct_get_mark(ct); |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 174 | ovs_ct_get_labels(ct, &key->ct.labels); |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 175 | |
| 176 | if (ct) { |
| 177 | const struct nf_conntrack_tuple *orig; |
| 178 | |
| 179 | /* Use the master if we have one. */ |
| 180 | if (ct->master) |
| 181 | ct = ct->master; |
| 182 | orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; |
| 183 | |
| 184 | /* IP version must match with the master connection. */ |
| 185 | if (key->eth.type == htons(ETH_P_IP) && |
| 186 | nf_ct_l3num(ct) == NFPROTO_IPV4) { |
| 187 | key->ipv4.ct_orig.src = orig->src.u3.ip; |
| 188 | key->ipv4.ct_orig.dst = orig->dst.u3.ip; |
| 189 | __ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP); |
| 190 | return; |
| 191 | } else if (key->eth.type == htons(ETH_P_IPV6) && |
| 192 | !sw_flow_key_is_nd(key) && |
| 193 | nf_ct_l3num(ct) == NFPROTO_IPV6) { |
| 194 | key->ipv6.ct_orig.src = orig->src.u3.in6; |
| 195 | key->ipv6.ct_orig.dst = orig->dst.u3.in6; |
| 196 | __ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP); |
| 197 | return; |
| 198 | } |
| 199 | } |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 200 | /* Clear 'ct_orig_proto' to mark the non-existence of conntrack |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 201 | * original direction key fields. |
| 202 | */ |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 203 | key->ct_orig_proto = 0; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 204 | } |
| 205 | |
Jarno Rajahalme | 5e17da6 | 2017-02-09 11:21:52 -0800 | [diff] [blame] | 206 | /* Update 'key' based on skb->_nfct. If 'post_ct' is true, then OVS has |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 207 | * previously sent the packet to conntrack via the ct action. If |
| 208 | * 'keep_nat_flags' is true, the existing NAT flags retained, else they are |
| 209 | * initialized from the connection status. |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 210 | */ |
| 211 | static void ovs_ct_update_key(const struct sk_buff *skb, |
Joe Stringer | d110986 | 2015-12-09 14:07:40 -0800 | [diff] [blame] | 212 | const struct ovs_conntrack_info *info, |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 213 | struct sw_flow_key *key, bool post_ct, |
| 214 | bool keep_nat_flags) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 215 | { |
| 216 | const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt; |
| 217 | enum ip_conntrack_info ctinfo; |
| 218 | struct nf_conn *ct; |
| 219 | u8 state = 0; |
| 220 | |
| 221 | ct = nf_ct_get(skb, &ctinfo); |
| 222 | if (ct) { |
| 223 | state = ovs_ct_get_state(ctinfo); |
Jarno Rajahalme | 9f13ded | 2016-03-10 10:54:18 -0800 | [diff] [blame] | 224 | /* All unconfirmed entries are NEW connections. */ |
Joe Stringer | 4f0909e | 2015-10-19 19:18:59 -0700 | [diff] [blame] | 225 | if (!nf_ct_is_confirmed(ct)) |
| 226 | state |= OVS_CS_F_NEW; |
Jarno Rajahalme | 9f13ded | 2016-03-10 10:54:18 -0800 | [diff] [blame] | 227 | /* OVS persists the related flag for the duration of the |
| 228 | * connection. |
| 229 | */ |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 230 | if (ct->master) |
| 231 | state |= OVS_CS_F_RELATED; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 232 | if (keep_nat_flags) { |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 233 | state |= key->ct_state & OVS_CS_F_NAT_MASK; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 234 | } else { |
| 235 | if (ct->status & IPS_SRC_NAT) |
| 236 | state |= OVS_CS_F_SRC_NAT; |
| 237 | if (ct->status & IPS_DST_NAT) |
| 238 | state |= OVS_CS_F_DST_NAT; |
| 239 | } |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 240 | zone = nf_ct_zone(ct); |
| 241 | } else if (post_ct) { |
| 242 | state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID; |
Joe Stringer | d110986 | 2015-12-09 14:07:40 -0800 | [diff] [blame] | 243 | if (info) |
| 244 | zone = &info->zone; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 245 | } |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 246 | __ovs_ct_update_key(key, state, zone, ct); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 247 | } |
| 248 | |
Jarno Rajahalme | 9f13ded | 2016-03-10 10:54:18 -0800 | [diff] [blame] | 249 | /* This is called to initialize CT key fields possibly coming in from the local |
| 250 | * stack. |
| 251 | */ |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 252 | void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key) |
| 253 | { |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 254 | ovs_ct_update_key(skb, NULL, key, false, false); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 255 | } |
| 256 | |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 257 | #define IN6_ADDR_INITIALIZER(ADDR) \ |
| 258 | { (ADDR).s6_addr32[0], (ADDR).s6_addr32[1], \ |
| 259 | (ADDR).s6_addr32[2], (ADDR).s6_addr32[3] } |
| 260 | |
| 261 | int ovs_ct_put_key(const struct sw_flow_key *swkey, |
| 262 | const struct sw_flow_key *output, struct sk_buff *skb) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 263 | { |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 264 | if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state)) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 265 | return -EMSGSIZE; |
| 266 | |
| 267 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 268 | nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone)) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 269 | return -EMSGSIZE; |
| 270 | |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 271 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 272 | nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark)) |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 273 | return -EMSGSIZE; |
| 274 | |
Valentin Rothberg | 9723e6a | 2015-08-28 10:39:56 +0200 | [diff] [blame] | 275 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 276 | nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels), |
| 277 | &output->ct.labels)) |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 278 | return -EMSGSIZE; |
| 279 | |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 280 | if (swkey->ct_orig_proto) { |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 281 | if (swkey->eth.type == htons(ETH_P_IP)) { |
| 282 | struct ovs_key_ct_tuple_ipv4 orig = { |
| 283 | output->ipv4.ct_orig.src, |
| 284 | output->ipv4.ct_orig.dst, |
| 285 | output->ct.orig_tp.src, |
| 286 | output->ct.orig_tp.dst, |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 287 | output->ct_orig_proto, |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 288 | }; |
| 289 | if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4, |
| 290 | sizeof(orig), &orig)) |
| 291 | return -EMSGSIZE; |
| 292 | } else if (swkey->eth.type == htons(ETH_P_IPV6)) { |
| 293 | struct ovs_key_ct_tuple_ipv6 orig = { |
| 294 | IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.src), |
| 295 | IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.dst), |
| 296 | output->ct.orig_tp.src, |
| 297 | output->ct.orig_tp.dst, |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 298 | output->ct_orig_proto, |
Jarno Rajahalme | 9dd7f89 | 2017-02-09 11:21:59 -0800 | [diff] [blame] | 299 | }; |
| 300 | if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6, |
| 301 | sizeof(orig), &orig)) |
| 302 | return -EMSGSIZE; |
| 303 | } |
| 304 | } |
| 305 | |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 306 | return 0; |
| 307 | } |
| 308 | |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 309 | static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key, |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 310 | u32 ct_mark, u32 mask) |
| 311 | { |
Joe Stringer | 0d5cdef | 2015-08-28 19:22:11 -0700 | [diff] [blame] | 312 | #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 313 | u32 new_mark; |
| 314 | |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 315 | new_mark = ct_mark | (ct->mark & ~(mask)); |
| 316 | if (ct->mark != new_mark) { |
| 317 | ct->mark = new_mark; |
Jarno Rajahalme | 193e309 | 2017-02-09 11:21:54 -0800 | [diff] [blame] | 318 | if (nf_ct_is_confirmed(ct)) |
| 319 | nf_conntrack_event_cache(IPCT_MARK, ct); |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 320 | key->ct.mark = new_mark; |
| 321 | } |
| 322 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 323 | return 0; |
Joe Stringer | 0d5cdef | 2015-08-28 19:22:11 -0700 | [diff] [blame] | 324 | #else |
| 325 | return -ENOTSUPP; |
| 326 | #endif |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 327 | } |
| 328 | |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 329 | static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct) |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 330 | { |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 331 | struct nf_conn_labels *cl; |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 332 | |
| 333 | cl = nf_ct_labels_find(ct); |
| 334 | if (!cl) { |
| 335 | nf_ct_labels_ext_add(ct); |
| 336 | cl = nf_ct_labels_find(ct); |
| 337 | } |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 338 | |
| 339 | return cl; |
| 340 | } |
| 341 | |
| 342 | /* Initialize labels for a new, yet to be committed conntrack entry. Note that |
| 343 | * since the new connection is not yet confirmed, and thus no-one else has |
Jarno Rajahalme | 2317c6b | 2017-02-17 18:11:58 -0800 | [diff] [blame] | 344 | * access to it's labels, we simply write them over. |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 345 | */ |
| 346 | static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key, |
| 347 | const struct ovs_key_ct_labels *labels, |
| 348 | const struct ovs_key_ct_labels *mask) |
| 349 | { |
Jarno Rajahalme | 09aa98a | 2017-02-09 11:21:58 -0800 | [diff] [blame] | 350 | struct nf_conn_labels *cl, *master_cl; |
| 351 | bool have_mask = labels_nonzero(mask); |
| 352 | |
| 353 | /* Inherit master's labels to the related connection? */ |
| 354 | master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL; |
| 355 | |
| 356 | if (!master_cl && !have_mask) |
| 357 | return 0; /* Nothing to do. */ |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 358 | |
| 359 | cl = ovs_ct_get_conn_labels(ct); |
Jarno Rajahalme | b87cec3 | 2017-02-09 11:21:56 -0800 | [diff] [blame] | 360 | if (!cl) |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 361 | return -ENOSPC; |
| 362 | |
Jarno Rajahalme | 09aa98a | 2017-02-09 11:21:58 -0800 | [diff] [blame] | 363 | /* Inherit the master's labels, if any. */ |
| 364 | if (master_cl) |
| 365 | *cl = *master_cl; |
| 366 | |
| 367 | if (have_mask) { |
| 368 | u32 *dst = (u32 *)cl->bits; |
| 369 | int i; |
| 370 | |
| 371 | for (i = 0; i < OVS_CT_LABELS_LEN_32; i++) |
| 372 | dst[i] = (dst[i] & ~mask->ct_labels_32[i]) | |
| 373 | (labels->ct_labels_32[i] |
| 374 | & mask->ct_labels_32[i]); |
| 375 | } |
Jarno Rajahalme | 193e309 | 2017-02-09 11:21:54 -0800 | [diff] [blame] | 376 | |
Jarno Rajahalme | 2317c6b | 2017-02-17 18:11:58 -0800 | [diff] [blame] | 377 | /* Labels are included in the IPCTNL_MSG_CT_NEW event only if the |
Jarno Rajahalme | abd0a4f | 2017-04-21 16:48:05 -0700 | [diff] [blame] | 378 | * IPCT_LABEL bit is set in the event cache. |
Jarno Rajahalme | 2317c6b | 2017-02-17 18:11:58 -0800 | [diff] [blame] | 379 | */ |
| 380 | nf_conntrack_event_cache(IPCT_LABEL, ct); |
| 381 | |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 382 | memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 383 | |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key, |
| 388 | const struct ovs_key_ct_labels *labels, |
| 389 | const struct ovs_key_ct_labels *mask) |
| 390 | { |
| 391 | struct nf_conn_labels *cl; |
| 392 | int err; |
| 393 | |
| 394 | cl = ovs_ct_get_conn_labels(ct); |
| 395 | if (!cl) |
| 396 | return -ENOSPC; |
| 397 | |
| 398 | err = nf_connlabels_replace(ct, labels->ct_labels_32, |
| 399 | mask->ct_labels_32, |
| 400 | OVS_CT_LABELS_LEN_32); |
| 401 | if (err) |
| 402 | return err; |
| 403 | |
| 404 | memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN); |
| 405 | |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 406 | return 0; |
| 407 | } |
| 408 | |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 409 | /* 'skb' should already be pulled to nh_ofs. */ |
| 410 | static int ovs_ct_helper(struct sk_buff *skb, u16 proto) |
| 411 | { |
| 412 | const struct nf_conntrack_helper *helper; |
| 413 | const struct nf_conn_help *help; |
| 414 | enum ip_conntrack_info ctinfo; |
| 415 | unsigned int protoff; |
| 416 | struct nf_conn *ct; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 417 | int err; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 418 | |
| 419 | ct = nf_ct_get(skb, &ctinfo); |
| 420 | if (!ct || ctinfo == IP_CT_RELATED_REPLY) |
| 421 | return NF_ACCEPT; |
| 422 | |
| 423 | help = nfct_help(ct); |
| 424 | if (!help) |
| 425 | return NF_ACCEPT; |
| 426 | |
| 427 | helper = rcu_dereference(help->helper); |
| 428 | if (!helper) |
| 429 | return NF_ACCEPT; |
| 430 | |
| 431 | switch (proto) { |
| 432 | case NFPROTO_IPV4: |
| 433 | protoff = ip_hdrlen(skb); |
| 434 | break; |
| 435 | case NFPROTO_IPV6: { |
| 436 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
| 437 | __be16 frag_off; |
Joe Stringer | cc57060 | 2015-09-14 11:14:50 -0700 | [diff] [blame] | 438 | int ofs; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 439 | |
Joe Stringer | cc57060 | 2015-09-14 11:14:50 -0700 | [diff] [blame] | 440 | ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, |
| 441 | &frag_off); |
| 442 | if (ofs < 0 || (frag_off & htons(~0x7)) != 0) { |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 443 | pr_debug("proto header not found\n"); |
| 444 | return NF_ACCEPT; |
| 445 | } |
Joe Stringer | cc57060 | 2015-09-14 11:14:50 -0700 | [diff] [blame] | 446 | protoff = ofs; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 447 | break; |
| 448 | } |
| 449 | default: |
| 450 | WARN_ONCE(1, "helper invoked on non-IP family!"); |
| 451 | return NF_DROP; |
| 452 | } |
| 453 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 454 | err = helper->help(skb, protoff, ct, ctinfo); |
| 455 | if (err != NF_ACCEPT) |
| 456 | return err; |
| 457 | |
| 458 | /* Adjust seqs after helper. This is needed due to some helpers (e.g., |
| 459 | * FTP with NAT) adusting the TCP payload size when mangling IP |
| 460 | * addresses and/or port numbers in the text-based control connection. |
| 461 | */ |
| 462 | if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && |
| 463 | !nf_ct_seq_adjust(skb, ct, ctinfo, protoff)) |
| 464 | return NF_DROP; |
| 465 | return NF_ACCEPT; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 466 | } |
| 467 | |
Joe Stringer | 74c1661 | 2015-10-25 20:21:48 -0700 | [diff] [blame] | 468 | /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero |
| 469 | * value if 'skb' is freed. |
| 470 | */ |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 471 | static int handle_fragments(struct net *net, struct sw_flow_key *key, |
| 472 | u16 zone, struct sk_buff *skb) |
| 473 | { |
| 474 | struct ovs_skb_cb ovs_cb = *OVS_CB(skb); |
Florian Westphal | daaa7d6 | 2015-11-18 23:32:40 +0100 | [diff] [blame] | 475 | int err; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 476 | |
| 477 | if (key->eth.type == htons(ETH_P_IP)) { |
| 478 | enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 479 | |
| 480 | memset(IPCB(skb), 0, sizeof(struct inet_skb_parm)); |
Eric W. Biederman | 19bcf9f | 2015-10-09 13:44:54 -0500 | [diff] [blame] | 481 | err = ip_defrag(net, skb, user); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 482 | if (err) |
| 483 | return err; |
| 484 | |
| 485 | ovs_cb.mru = IPCB(skb)->frag_max_size; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 486 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
Joe Stringer | 74c1661 | 2015-10-25 20:21:48 -0700 | [diff] [blame] | 487 | } else if (key->eth.type == htons(ETH_P_IPV6)) { |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 488 | enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 489 | |
| 490 | memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); |
Florian Westphal | daaa7d6 | 2015-11-18 23:32:40 +0100 | [diff] [blame] | 491 | err = nf_ct_frag6_gather(net, skb, user); |
Daniele Di Proietto | f92a80a | 2016-11-28 15:43:53 -0800 | [diff] [blame] | 492 | if (err) { |
| 493 | if (err != -EINPROGRESS) |
| 494 | kfree_skb(skb); |
Florian Westphal | daaa7d6 | 2015-11-18 23:32:40 +0100 | [diff] [blame] | 495 | return err; |
Daniele Di Proietto | f92a80a | 2016-11-28 15:43:53 -0800 | [diff] [blame] | 496 | } |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 497 | |
Florian Westphal | daaa7d6 | 2015-11-18 23:32:40 +0100 | [diff] [blame] | 498 | key->ip.proto = ipv6_hdr(skb)->nexthdr; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 499 | ovs_cb.mru = IP6CB(skb)->frag_max_size; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 500 | #endif |
| 501 | } else { |
Joe Stringer | 74c1661 | 2015-10-25 20:21:48 -0700 | [diff] [blame] | 502 | kfree_skb(skb); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 503 | return -EPFNOSUPPORT; |
| 504 | } |
| 505 | |
| 506 | key->ip.frag = OVS_FRAG_TYPE_NONE; |
| 507 | skb_clear_hash(skb); |
| 508 | skb->ignore_df = 1; |
| 509 | *OVS_CB(skb) = ovs_cb; |
| 510 | |
| 511 | return 0; |
| 512 | } |
| 513 | |
| 514 | static struct nf_conntrack_expect * |
| 515 | ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone, |
| 516 | u16 proto, const struct sk_buff *skb) |
| 517 | { |
| 518 | struct nf_conntrack_tuple tuple; |
Jarno Rajahalme | cf5d709 | 2017-04-14 14:26:38 -0700 | [diff] [blame] | 519 | struct nf_conntrack_expect *exp; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 520 | |
Eric W. Biederman | a31f1ad | 2015-09-18 14:33:04 -0500 | [diff] [blame] | 521 | if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple)) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 522 | return NULL; |
Jarno Rajahalme | cf5d709 | 2017-04-14 14:26:38 -0700 | [diff] [blame] | 523 | |
| 524 | exp = __nf_ct_expect_find(net, zone, &tuple); |
| 525 | if (exp) { |
| 526 | struct nf_conntrack_tuple_hash *h; |
| 527 | |
| 528 | /* Delete existing conntrack entry, if it clashes with the |
| 529 | * expectation. This can happen since conntrack ALGs do not |
| 530 | * check for clashes between (new) expectations and existing |
| 531 | * conntrack entries. nf_conntrack_in() will check the |
| 532 | * expectations only if a conntrack entry can not be found, |
| 533 | * which can lead to OVS finding the expectation (here) in the |
| 534 | * init direction, but which will not be removed by the |
| 535 | * nf_conntrack_in() call, if a matching conntrack entry is |
| 536 | * found instead. In this case all init direction packets |
| 537 | * would be reported as new related packets, while reply |
| 538 | * direction packets would be reported as un-related |
| 539 | * established packets. |
| 540 | */ |
| 541 | h = nf_conntrack_find_get(net, zone, &tuple); |
| 542 | if (h) { |
| 543 | struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); |
| 544 | |
| 545 | nf_ct_delete(ct, 0, 0); |
| 546 | nf_conntrack_put(&ct->ct_general); |
| 547 | } |
| 548 | } |
| 549 | |
| 550 | return exp; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 551 | } |
| 552 | |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 553 | /* This replicates logic from nf_conntrack_core.c that is not exported. */ |
| 554 | static enum ip_conntrack_info |
| 555 | ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h) |
| 556 | { |
| 557 | const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); |
| 558 | |
| 559 | if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) |
| 560 | return IP_CT_ESTABLISHED_REPLY; |
| 561 | /* Once we've had two way comms, always ESTABLISHED. */ |
| 562 | if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) |
| 563 | return IP_CT_ESTABLISHED; |
| 564 | if (test_bit(IPS_EXPECTED_BIT, &ct->status)) |
| 565 | return IP_CT_RELATED; |
| 566 | return IP_CT_NEW; |
| 567 | } |
| 568 | |
| 569 | /* Find an existing connection which this packet belongs to without |
| 570 | * re-attributing statistics or modifying the connection state. This allows an |
Jarno Rajahalme | 5e17da6 | 2017-02-09 11:21:52 -0800 | [diff] [blame] | 571 | * skb->_nfct lost due to an upcall to be recovered during actions execution. |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 572 | * |
| 573 | * Must be called with rcu_read_lock. |
| 574 | * |
Jarno Rajahalme | 5e17da6 | 2017-02-09 11:21:52 -0800 | [diff] [blame] | 575 | * On success, populates skb->_nfct and returns the connection. Returns NULL |
| 576 | * if there is no existing entry. |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 577 | */ |
| 578 | static struct nf_conn * |
| 579 | ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone, |
Jarno Rajahalme | 9ff464d | 2017-02-09 11:21:53 -0800 | [diff] [blame] | 580 | u8 l3num, struct sk_buff *skb, bool natted) |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 581 | { |
| 582 | struct nf_conntrack_l3proto *l3proto; |
| 583 | struct nf_conntrack_l4proto *l4proto; |
| 584 | struct nf_conntrack_tuple tuple; |
| 585 | struct nf_conntrack_tuple_hash *h; |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 586 | struct nf_conn *ct; |
| 587 | unsigned int dataoff; |
| 588 | u8 protonum; |
| 589 | |
| 590 | l3proto = __nf_ct_l3proto_find(l3num); |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 591 | if (l3proto->get_l4proto(skb, skb_network_offset(skb), &dataoff, |
| 592 | &protonum) <= 0) { |
| 593 | pr_debug("ovs_ct_find_existing: Can't get protonum\n"); |
| 594 | return NULL; |
| 595 | } |
| 596 | l4proto = __nf_ct_l4proto_find(l3num, protonum); |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 597 | if (!nf_ct_get_tuple(skb, skb_network_offset(skb), dataoff, l3num, |
| 598 | protonum, net, &tuple, l3proto, l4proto)) { |
| 599 | pr_debug("ovs_ct_find_existing: Can't get tuple\n"); |
| 600 | return NULL; |
| 601 | } |
| 602 | |
Jarno Rajahalme | 9ff464d | 2017-02-09 11:21:53 -0800 | [diff] [blame] | 603 | /* Must invert the tuple if skb has been transformed by NAT. */ |
| 604 | if (natted) { |
| 605 | struct nf_conntrack_tuple inverse; |
| 606 | |
| 607 | if (!nf_ct_invert_tuple(&inverse, &tuple, l3proto, l4proto)) { |
| 608 | pr_debug("ovs_ct_find_existing: Inversion failed!\n"); |
| 609 | return NULL; |
| 610 | } |
| 611 | tuple = inverse; |
| 612 | } |
| 613 | |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 614 | /* look for tuple match */ |
| 615 | h = nf_conntrack_find_get(net, zone, &tuple); |
| 616 | if (!h) |
| 617 | return NULL; /* Not found. */ |
| 618 | |
| 619 | ct = nf_ct_tuplehash_to_ctrack(h); |
| 620 | |
Jarno Rajahalme | 9ff464d | 2017-02-09 11:21:53 -0800 | [diff] [blame] | 621 | /* Inverted packet tuple matches the reverse direction conntrack tuple, |
| 622 | * select the other tuplehash to get the right 'ctinfo' bits for this |
| 623 | * packet. |
| 624 | */ |
| 625 | if (natted) |
| 626 | h = &ct->tuplehash[!h->tuple.dst.dir]; |
| 627 | |
Florian Westphal | c74454f | 2017-01-23 18:21:57 +0100 | [diff] [blame] | 628 | nf_ct_set(skb, ct, ovs_ct_get_info(h)); |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 629 | return ct; |
| 630 | } |
| 631 | |
Greg Rose | 8b97ac5 | 2017-07-14 12:42:49 -0700 | [diff] [blame] | 632 | static |
| 633 | struct nf_conn *ovs_ct_executed(struct net *net, |
| 634 | const struct sw_flow_key *key, |
| 635 | const struct ovs_conntrack_info *info, |
| 636 | struct sk_buff *skb, |
| 637 | bool *ct_executed) |
| 638 | { |
| 639 | struct nf_conn *ct = NULL; |
| 640 | |
| 641 | /* If no ct, check if we have evidence that an existing conntrack entry |
| 642 | * might be found for this skb. This happens when we lose a skb->_nfct |
| 643 | * due to an upcall, or if the direction is being forced. If the |
| 644 | * connection was not confirmed, it is not cached and needs to be run |
| 645 | * through conntrack again. |
| 646 | */ |
| 647 | *ct_executed = (key->ct_state & OVS_CS_F_TRACKED) && |
| 648 | !(key->ct_state & OVS_CS_F_INVALID) && |
| 649 | (key->ct_zone == info->zone.id); |
| 650 | |
| 651 | if (*ct_executed || (!key->ct_state && info->force)) { |
| 652 | ct = ovs_ct_find_existing(net, &info->zone, info->family, skb, |
| 653 | !!(key->ct_state & |
| 654 | OVS_CS_F_NAT_MASK)); |
| 655 | } |
| 656 | |
| 657 | return ct; |
| 658 | } |
| 659 | |
Jarno Rajahalme | 5e17da6 | 2017-02-09 11:21:52 -0800 | [diff] [blame] | 660 | /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */ |
Jarno Rajahalme | 289f225 | 2016-03-10 10:54:20 -0800 | [diff] [blame] | 661 | static bool skb_nfct_cached(struct net *net, |
| 662 | const struct sw_flow_key *key, |
| 663 | const struct ovs_conntrack_info *info, |
| 664 | struct sk_buff *skb) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 665 | { |
| 666 | enum ip_conntrack_info ctinfo; |
| 667 | struct nf_conn *ct; |
Greg Rose | 8b97ac5 | 2017-07-14 12:42:49 -0700 | [diff] [blame] | 668 | bool ct_executed = true; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 669 | |
| 670 | ct = nf_ct_get(skb, &ctinfo); |
| 671 | if (!ct) |
Greg Rose | 8b97ac5 | 2017-07-14 12:42:49 -0700 | [diff] [blame] | 672 | ct = ovs_ct_executed(net, key, info, skb, &ct_executed); |
| 673 | |
| 674 | if (ct) |
| 675 | nf_ct_get(skb, &ctinfo); |
| 676 | else |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 677 | return false; |
Greg Rose | 8b97ac5 | 2017-07-14 12:42:49 -0700 | [diff] [blame] | 678 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 679 | if (!net_eq(net, read_pnet(&ct->ct_net))) |
| 680 | return false; |
| 681 | if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct))) |
| 682 | return false; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 683 | if (info->helper) { |
| 684 | struct nf_conn_help *help; |
| 685 | |
| 686 | help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER); |
| 687 | if (help && rcu_access_pointer(help->helper) != info->helper) |
| 688 | return false; |
| 689 | } |
Jarno Rajahalme | dd41d33 | 2017-02-09 11:22:00 -0800 | [diff] [blame] | 690 | /* Force conntrack entry direction to the current packet? */ |
| 691 | if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) { |
| 692 | /* Delete the conntrack entry if confirmed, else just release |
| 693 | * the reference. |
| 694 | */ |
| 695 | if (nf_ct_is_confirmed(ct)) |
| 696 | nf_ct_delete(ct, 0, 0); |
Jarno Rajahalme | b768b16 | 2017-03-28 11:25:26 -0700 | [diff] [blame] | 697 | |
| 698 | nf_conntrack_put(&ct->ct_general); |
Jarno Rajahalme | dd41d33 | 2017-02-09 11:22:00 -0800 | [diff] [blame] | 699 | nf_ct_set(skb, NULL, 0); |
| 700 | return false; |
| 701 | } |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 702 | |
Greg Rose | 8b97ac5 | 2017-07-14 12:42:49 -0700 | [diff] [blame] | 703 | return ct_executed; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 704 | } |
| 705 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 706 | #ifdef CONFIG_NF_NAT_NEEDED |
| 707 | /* Modelled after nf_nat_ipv[46]_fn(). |
| 708 | * range is only used for new, uninitialized NAT state. |
| 709 | * Returns either NF_ACCEPT or NF_DROP. |
| 710 | */ |
| 711 | static int ovs_ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct, |
| 712 | enum ip_conntrack_info ctinfo, |
| 713 | const struct nf_nat_range *range, |
| 714 | enum nf_nat_manip_type maniptype) |
| 715 | { |
| 716 | int hooknum, nh_off, err = NF_ACCEPT; |
| 717 | |
| 718 | nh_off = skb_network_offset(skb); |
Lance Richardson | 75f01a4 | 2017-01-12 19:33:18 -0500 | [diff] [blame] | 719 | skb_pull_rcsum(skb, nh_off); |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 720 | |
| 721 | /* See HOOK2MANIP(). */ |
| 722 | if (maniptype == NF_NAT_MANIP_SRC) |
| 723 | hooknum = NF_INET_LOCAL_IN; /* Source NAT */ |
| 724 | else |
| 725 | hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */ |
| 726 | |
| 727 | switch (ctinfo) { |
| 728 | case IP_CT_RELATED: |
| 729 | case IP_CT_RELATED_REPLY: |
Arnd Bergmann | 99b7248 | 2016-03-18 14:33:45 +0100 | [diff] [blame] | 730 | if (IS_ENABLED(CONFIG_NF_NAT_IPV4) && |
| 731 | skb->protocol == htons(ETH_P_IP) && |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 732 | ip_hdr(skb)->protocol == IPPROTO_ICMP) { |
| 733 | if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo, |
| 734 | hooknum)) |
| 735 | err = NF_DROP; |
| 736 | goto push; |
Arnd Bergmann | 99b7248 | 2016-03-18 14:33:45 +0100 | [diff] [blame] | 737 | } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) && |
| 738 | skb->protocol == htons(ETH_P_IPV6)) { |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 739 | __be16 frag_off; |
| 740 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
| 741 | int hdrlen = ipv6_skip_exthdr(skb, |
| 742 | sizeof(struct ipv6hdr), |
| 743 | &nexthdr, &frag_off); |
| 744 | |
| 745 | if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) { |
| 746 | if (!nf_nat_icmpv6_reply_translation(skb, ct, |
| 747 | ctinfo, |
| 748 | hooknum, |
| 749 | hdrlen)) |
| 750 | err = NF_DROP; |
| 751 | goto push; |
| 752 | } |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 753 | } |
| 754 | /* Non-ICMP, fall thru to initialize if needed. */ |
| 755 | case IP_CT_NEW: |
| 756 | /* Seen it before? This can happen for loopback, retrans, |
| 757 | * or local packets. |
| 758 | */ |
| 759 | if (!nf_nat_initialized(ct, maniptype)) { |
| 760 | /* Initialize according to the NAT action. */ |
| 761 | err = (range && range->flags & NF_NAT_RANGE_MAP_IPS) |
| 762 | /* Action is set up to establish a new |
| 763 | * mapping. |
| 764 | */ |
| 765 | ? nf_nat_setup_info(ct, range, maniptype) |
| 766 | : nf_nat_alloc_null_binding(ct, hooknum); |
| 767 | if (err != NF_ACCEPT) |
| 768 | goto push; |
| 769 | } |
| 770 | break; |
| 771 | |
| 772 | case IP_CT_ESTABLISHED: |
| 773 | case IP_CT_ESTABLISHED_REPLY: |
| 774 | break; |
| 775 | |
| 776 | default: |
| 777 | err = NF_DROP; |
| 778 | goto push; |
| 779 | } |
| 780 | |
| 781 | err = nf_nat_packet(ct, ctinfo, hooknum, skb); |
| 782 | push: |
| 783 | skb_push(skb, nh_off); |
Lance Richardson | 75f01a4 | 2017-01-12 19:33:18 -0500 | [diff] [blame] | 784 | skb_postpush_rcsum(skb, skb->data, nh_off); |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 785 | |
| 786 | return err; |
| 787 | } |
| 788 | |
| 789 | static void ovs_nat_update_key(struct sw_flow_key *key, |
| 790 | const struct sk_buff *skb, |
| 791 | enum nf_nat_manip_type maniptype) |
| 792 | { |
| 793 | if (maniptype == NF_NAT_MANIP_SRC) { |
| 794 | __be16 src; |
| 795 | |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 796 | key->ct_state |= OVS_CS_F_SRC_NAT; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 797 | if (key->eth.type == htons(ETH_P_IP)) |
| 798 | key->ipv4.addr.src = ip_hdr(skb)->saddr; |
| 799 | else if (key->eth.type == htons(ETH_P_IPV6)) |
| 800 | memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr, |
| 801 | sizeof(key->ipv6.addr.src)); |
| 802 | else |
| 803 | return; |
| 804 | |
| 805 | if (key->ip.proto == IPPROTO_UDP) |
| 806 | src = udp_hdr(skb)->source; |
| 807 | else if (key->ip.proto == IPPROTO_TCP) |
| 808 | src = tcp_hdr(skb)->source; |
| 809 | else if (key->ip.proto == IPPROTO_SCTP) |
| 810 | src = sctp_hdr(skb)->source; |
| 811 | else |
| 812 | return; |
| 813 | |
| 814 | key->tp.src = src; |
| 815 | } else { |
| 816 | __be16 dst; |
| 817 | |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 818 | key->ct_state |= OVS_CS_F_DST_NAT; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 819 | if (key->eth.type == htons(ETH_P_IP)) |
| 820 | key->ipv4.addr.dst = ip_hdr(skb)->daddr; |
| 821 | else if (key->eth.type == htons(ETH_P_IPV6)) |
| 822 | memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr, |
| 823 | sizeof(key->ipv6.addr.dst)); |
| 824 | else |
| 825 | return; |
| 826 | |
| 827 | if (key->ip.proto == IPPROTO_UDP) |
| 828 | dst = udp_hdr(skb)->dest; |
| 829 | else if (key->ip.proto == IPPROTO_TCP) |
| 830 | dst = tcp_hdr(skb)->dest; |
| 831 | else if (key->ip.proto == IPPROTO_SCTP) |
| 832 | dst = sctp_hdr(skb)->dest; |
| 833 | else |
| 834 | return; |
| 835 | |
| 836 | key->tp.dst = dst; |
| 837 | } |
| 838 | } |
| 839 | |
| 840 | /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */ |
| 841 | static int ovs_ct_nat(struct net *net, struct sw_flow_key *key, |
| 842 | const struct ovs_conntrack_info *info, |
| 843 | struct sk_buff *skb, struct nf_conn *ct, |
| 844 | enum ip_conntrack_info ctinfo) |
| 845 | { |
| 846 | enum nf_nat_manip_type maniptype; |
| 847 | int err; |
| 848 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 849 | /* Add NAT extension if not confirmed yet. */ |
| 850 | if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct)) |
| 851 | return NF_ACCEPT; /* Can't NAT. */ |
| 852 | |
| 853 | /* Determine NAT type. |
| 854 | * Check if the NAT type can be deduced from the tracked connection. |
Jarno Rajahalme | 5745b0b | 2016-03-21 11:15:19 -0700 | [diff] [blame] | 855 | * Make sure new expected connections (IP_CT_RELATED) are NATted only |
| 856 | * when committing. |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 857 | */ |
| 858 | if (info->nat & OVS_CT_NAT && ctinfo != IP_CT_NEW && |
| 859 | ct->status & IPS_NAT_MASK && |
Jarno Rajahalme | 5745b0b | 2016-03-21 11:15:19 -0700 | [diff] [blame] | 860 | (ctinfo != IP_CT_RELATED || info->commit)) { |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 861 | /* NAT an established or related connection like before. */ |
| 862 | if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) |
| 863 | /* This is the REPLY direction for a connection |
| 864 | * for which NAT was applied in the forward |
| 865 | * direction. Do the reverse NAT. |
| 866 | */ |
| 867 | maniptype = ct->status & IPS_SRC_NAT |
| 868 | ? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC; |
| 869 | else |
| 870 | maniptype = ct->status & IPS_SRC_NAT |
| 871 | ? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST; |
| 872 | } else if (info->nat & OVS_CT_SRC_NAT) { |
| 873 | maniptype = NF_NAT_MANIP_SRC; |
| 874 | } else if (info->nat & OVS_CT_DST_NAT) { |
| 875 | maniptype = NF_NAT_MANIP_DST; |
| 876 | } else { |
| 877 | return NF_ACCEPT; /* Connection is not NATed. */ |
| 878 | } |
| 879 | err = ovs_ct_nat_execute(skb, ct, ctinfo, &info->range, maniptype); |
| 880 | |
| 881 | /* Mark NAT done if successful and update the flow key. */ |
| 882 | if (err == NF_ACCEPT) |
| 883 | ovs_nat_update_key(key, skb, maniptype); |
| 884 | |
| 885 | return err; |
| 886 | } |
| 887 | #else /* !CONFIG_NF_NAT_NEEDED */ |
| 888 | static int ovs_ct_nat(struct net *net, struct sw_flow_key *key, |
| 889 | const struct ovs_conntrack_info *info, |
| 890 | struct sk_buff *skb, struct nf_conn *ct, |
| 891 | enum ip_conntrack_info ctinfo) |
| 892 | { |
| 893 | return NF_ACCEPT; |
| 894 | } |
| 895 | #endif |
| 896 | |
Jarno Rajahalme | 9f13ded | 2016-03-10 10:54:18 -0800 | [diff] [blame] | 897 | /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if |
Jarno Rajahalme | 394e910 | 2016-03-10 10:54:19 -0800 | [diff] [blame] | 898 | * not done already. Update key with new CT state after passing the packet |
| 899 | * through conntrack. |
Jarno Rajahalme | 5e17da6 | 2017-02-09 11:21:52 -0800 | [diff] [blame] | 900 | * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be |
Jarno Rajahalme | 9f13ded | 2016-03-10 10:54:18 -0800 | [diff] [blame] | 901 | * set to NULL and 0 will be returned. |
| 902 | */ |
Joe Stringer | 4f0909e | 2015-10-19 19:18:59 -0700 | [diff] [blame] | 903 | static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key, |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 904 | const struct ovs_conntrack_info *info, |
| 905 | struct sk_buff *skb) |
| 906 | { |
| 907 | /* If we are recirculating packets to match on conntrack fields and |
| 908 | * committing with a separate conntrack action, then we don't need to |
| 909 | * actually run the packet through conntrack twice unless it's for a |
| 910 | * different zone. |
| 911 | */ |
Jarno Rajahalme | 28b6e0c | 2016-03-10 10:54:22 -0800 | [diff] [blame] | 912 | bool cached = skb_nfct_cached(net, key, info, skb); |
| 913 | enum ip_conntrack_info ctinfo; |
| 914 | struct nf_conn *ct; |
| 915 | |
| 916 | if (!cached) { |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 917 | struct nf_conn *tmpl = info->ct; |
Jarno Rajahalme | 5b6b929 | 2016-03-10 10:54:21 -0800 | [diff] [blame] | 918 | int err; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 919 | |
| 920 | /* Associate skb with specified zone. */ |
| 921 | if (tmpl) { |
Florian Westphal | cb9c683 | 2017-01-23 18:21:56 +0100 | [diff] [blame] | 922 | if (skb_nfct(skb)) |
| 923 | nf_conntrack_put(skb_nfct(skb)); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 924 | nf_conntrack_get(&tmpl->ct_general); |
Florian Westphal | c74454f | 2017-01-23 18:21:57 +0100 | [diff] [blame] | 925 | nf_ct_set(skb, tmpl, IP_CT_NEW); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 926 | } |
| 927 | |
Pablo Neira Ayuso | 08733a0 | 2016-11-03 10:56:43 +0100 | [diff] [blame] | 928 | err = nf_conntrack_in(net, info->family, |
| 929 | NF_INET_PRE_ROUTING, skb); |
Jarno Rajahalme | 5b6b929 | 2016-03-10 10:54:21 -0800 | [diff] [blame] | 930 | if (err != NF_ACCEPT) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 931 | return -ENOENT; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 932 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 933 | /* Clear CT state NAT flags to mark that we have not yet done |
| 934 | * NAT after the nf_conntrack_in() call. We can actually clear |
| 935 | * the whole state, as it will be re-initialized below. |
| 936 | */ |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 937 | key->ct_state = 0; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 938 | |
| 939 | /* Update the key, but keep the NAT flags. */ |
| 940 | ovs_ct_update_key(skb, info, key, true, true); |
Jarno Rajahalme | 28b6e0c | 2016-03-10 10:54:22 -0800 | [diff] [blame] | 941 | } |
Jarno Rajahalme | 394e910 | 2016-03-10 10:54:19 -0800 | [diff] [blame] | 942 | |
Jarno Rajahalme | 28b6e0c | 2016-03-10 10:54:22 -0800 | [diff] [blame] | 943 | ct = nf_ct_get(skb, &ctinfo); |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 944 | if (ct) { |
| 945 | /* Packets starting a new connection must be NATted before the |
| 946 | * helper, so that the helper knows about the NAT. We enforce |
| 947 | * this by delaying both NAT and helper calls for unconfirmed |
| 948 | * connections until the committing CT action. For later |
| 949 | * packets NAT and Helper may be called in either order. |
| 950 | * |
| 951 | * NAT will be done only if the CT action has NAT, and only |
| 952 | * once per packet (per zone), as guarded by the NAT bits in |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 953 | * the key->ct_state. |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 954 | */ |
Jarno Rajahalme | 316d4d7 | 2017-02-09 11:22:01 -0800 | [diff] [blame] | 955 | if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) && |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 956 | (nf_ct_is_confirmed(ct) || info->commit) && |
| 957 | ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) { |
| 958 | return -EINVAL; |
| 959 | } |
| 960 | |
Joe Stringer | 16ec3d4 | 2016-05-11 10:29:26 -0700 | [diff] [blame] | 961 | /* Userspace may decide to perform a ct lookup without a helper |
| 962 | * specified followed by a (recirculate and) commit with one. |
| 963 | * Therefore, for unconfirmed connections which we will commit, |
| 964 | * we need to attach the helper here. |
| 965 | */ |
| 966 | if (!nf_ct_is_confirmed(ct) && info->commit && |
| 967 | info->helper && !nfct_help(ct)) { |
| 968 | int err = __nf_ct_try_assign_helper(ct, info->ct, |
| 969 | GFP_ATOMIC); |
| 970 | if (err) |
| 971 | return err; |
| 972 | } |
| 973 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 974 | /* Call the helper only if: |
| 975 | * - nf_conntrack_in() was executed above ("!cached") for a |
| 976 | * confirmed connection, or |
| 977 | * - When committing an unconfirmed connection. |
| 978 | */ |
| 979 | if ((nf_ct_is_confirmed(ct) ? !cached : info->commit) && |
| 980 | ovs_ct_helper(skb, info->family) != NF_ACCEPT) { |
| 981 | return -EINVAL; |
| 982 | } |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 983 | } |
| 984 | |
| 985 | return 0; |
| 986 | } |
| 987 | |
| 988 | /* Lookup connection and read fields into key. */ |
| 989 | static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key, |
| 990 | const struct ovs_conntrack_info *info, |
| 991 | struct sk_buff *skb) |
| 992 | { |
| 993 | struct nf_conntrack_expect *exp; |
| 994 | |
Jarno Rajahalme | 9f13ded | 2016-03-10 10:54:18 -0800 | [diff] [blame] | 995 | /* If we pass an expected packet through nf_conntrack_in() the |
| 996 | * expectation is typically removed, but the packet could still be |
| 997 | * lost in upcall processing. To prevent this from happening we |
| 998 | * perform an explicit expectation lookup. Expected connections are |
| 999 | * always new, and will be passed through conntrack only when they are |
| 1000 | * committed, as it is OK to remove the expectation at that time. |
| 1001 | */ |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1002 | exp = ovs_ct_expect_find(net, &info->zone, info->family, skb); |
| 1003 | if (exp) { |
| 1004 | u8 state; |
| 1005 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1006 | /* NOTE: New connections are NATted and Helped only when |
| 1007 | * committed, so we are not calling into NAT here. |
| 1008 | */ |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1009 | state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED; |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 1010 | __ovs_ct_update_key(key, state, &info->zone, exp->master); |
Samuel Gauthier | d913d3a | 2016-06-28 17:22:26 +0200 | [diff] [blame] | 1011 | } else { |
| 1012 | struct nf_conn *ct; |
| 1013 | int err; |
| 1014 | |
| 1015 | err = __ovs_ct_lookup(net, key, info, skb); |
| 1016 | if (err) |
| 1017 | return err; |
| 1018 | |
Florian Westphal | cb9c683 | 2017-01-23 18:21:56 +0100 | [diff] [blame] | 1019 | ct = (struct nf_conn *)skb_nfct(skb); |
Samuel Gauthier | d913d3a | 2016-06-28 17:22:26 +0200 | [diff] [blame] | 1020 | if (ct) |
| 1021 | nf_ct_deliver_cached_events(ct); |
| 1022 | } |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1023 | |
| 1024 | return 0; |
| 1025 | } |
| 1026 | |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 1027 | static bool labels_nonzero(const struct ovs_key_ct_labels *labels) |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1028 | { |
| 1029 | size_t i; |
| 1030 | |
Jarno Rajahalme | cb80d58 | 2017-02-09 11:21:55 -0800 | [diff] [blame] | 1031 | for (i = 0; i < OVS_CT_LABELS_LEN_32; i++) |
| 1032 | if (labels->ct_labels_32[i]) |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1033 | return true; |
| 1034 | |
| 1035 | return false; |
| 1036 | } |
| 1037 | |
Jarno Rajahalme | 7d904c7 | 2016-06-21 14:59:38 -0700 | [diff] [blame] | 1038 | /* Lookup connection and confirm if unconfirmed. */ |
| 1039 | static int ovs_ct_commit(struct net *net, struct sw_flow_key *key, |
| 1040 | const struct ovs_conntrack_info *info, |
| 1041 | struct sk_buff *skb) |
| 1042 | { |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 1043 | enum ip_conntrack_info ctinfo; |
| 1044 | struct nf_conn *ct; |
Jarno Rajahalme | 7d904c7 | 2016-06-21 14:59:38 -0700 | [diff] [blame] | 1045 | int err; |
| 1046 | |
| 1047 | err = __ovs_ct_lookup(net, key, info, skb); |
| 1048 | if (err) |
| 1049 | return err; |
| 1050 | |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 1051 | /* The connection could be invalid, in which case this is a no-op.*/ |
| 1052 | ct = nf_ct_get(skb, &ctinfo); |
| 1053 | if (!ct) |
| 1054 | return 0; |
| 1055 | |
Jarno Rajahalme | 1206455 | 2017-04-21 16:48:06 -0700 | [diff] [blame] | 1056 | /* Set the conntrack event mask if given. NEW and DELETE events have |
| 1057 | * their own groups, but the NFNLGRP_CONNTRACK_UPDATE group listener |
| 1058 | * typically would receive many kinds of updates. Setting the event |
| 1059 | * mask allows those events to be filtered. The set event mask will |
| 1060 | * remain in effect for the lifetime of the connection unless changed |
| 1061 | * by a further CT action with both the commit flag and the eventmask |
| 1062 | * option. */ |
| 1063 | if (info->have_eventmask) { |
| 1064 | struct nf_conntrack_ecache *cache = nf_ct_ecache_find(ct); |
| 1065 | |
| 1066 | if (cache) |
| 1067 | cache->ctmask = info->eventmask; |
| 1068 | } |
| 1069 | |
Jarno Rajahalme | 7d904c7 | 2016-06-21 14:59:38 -0700 | [diff] [blame] | 1070 | /* Apply changes before confirming the connection so that the initial |
| 1071 | * conntrack NEW netlink event carries the values given in the CT |
| 1072 | * action. |
| 1073 | */ |
| 1074 | if (info->mark.mask) { |
Jarno Rajahalme | 6ffcea7 | 2017-02-09 11:21:57 -0800 | [diff] [blame] | 1075 | err = ovs_ct_set_mark(ct, key, info->mark.value, |
Jarno Rajahalme | 7d904c7 | 2016-06-21 14:59:38 -0700 | [diff] [blame] | 1076 | info->mark.mask); |
| 1077 | if (err) |
| 1078 | return err; |
| 1079 | } |
Jarno Rajahalme | 09aa98a | 2017-02-09 11:21:58 -0800 | [diff] [blame] | 1080 | if (!nf_ct_is_confirmed(ct)) { |
| 1081 | err = ovs_ct_init_labels(ct, key, &info->labels.value, |
| 1082 | &info->labels.mask); |
| 1083 | if (err) |
| 1084 | return err; |
| 1085 | } else if (labels_nonzero(&info->labels.mask)) { |
| 1086 | err = ovs_ct_set_labels(ct, key, &info->labels.value, |
| 1087 | &info->labels.mask); |
Jarno Rajahalme | 7d904c7 | 2016-06-21 14:59:38 -0700 | [diff] [blame] | 1088 | if (err) |
| 1089 | return err; |
| 1090 | } |
| 1091 | /* This will take care of sending queued events even if the connection |
| 1092 | * is already confirmed. |
| 1093 | */ |
| 1094 | if (nf_conntrack_confirm(skb) != NF_ACCEPT) |
| 1095 | return -EINVAL; |
| 1096 | |
| 1097 | return 0; |
| 1098 | } |
| 1099 | |
Joe Stringer | 74c1661 | 2015-10-25 20:21:48 -0700 | [diff] [blame] | 1100 | /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero |
| 1101 | * value if 'skb' is freed. |
| 1102 | */ |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1103 | int ovs_ct_execute(struct net *net, struct sk_buff *skb, |
| 1104 | struct sw_flow_key *key, |
| 1105 | const struct ovs_conntrack_info *info) |
| 1106 | { |
| 1107 | int nh_ofs; |
| 1108 | int err; |
| 1109 | |
| 1110 | /* The conntrack module expects to be working at L3. */ |
| 1111 | nh_ofs = skb_network_offset(skb); |
Lance Richardson | 75f01a4 | 2017-01-12 19:33:18 -0500 | [diff] [blame] | 1112 | skb_pull_rcsum(skb, nh_ofs); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1113 | |
| 1114 | if (key->ip.frag != OVS_FRAG_TYPE_NONE) { |
| 1115 | err = handle_fragments(net, key, info->zone.id, skb); |
| 1116 | if (err) |
| 1117 | return err; |
| 1118 | } |
| 1119 | |
Joe Stringer | ab38a7b | 2015-10-06 11:00:01 -0700 | [diff] [blame] | 1120 | if (info->commit) |
Jarno Rajahalme | 7d904c7 | 2016-06-21 14:59:38 -0700 | [diff] [blame] | 1121 | err = ovs_ct_commit(net, key, info, skb); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1122 | else |
| 1123 | err = ovs_ct_lookup(net, key, info, skb); |
| 1124 | |
| 1125 | skb_push(skb, nh_ofs); |
Lance Richardson | 75f01a4 | 2017-01-12 19:33:18 -0500 | [diff] [blame] | 1126 | skb_postpush_rcsum(skb, skb->data, nh_ofs); |
Joe Stringer | 74c1661 | 2015-10-25 20:21:48 -0700 | [diff] [blame] | 1127 | if (err) |
| 1128 | kfree_skb(skb); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1129 | return err; |
| 1130 | } |
| 1131 | |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1132 | static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name, |
| 1133 | const struct sw_flow_key *key, bool log) |
| 1134 | { |
| 1135 | struct nf_conntrack_helper *helper; |
| 1136 | struct nf_conn_help *help; |
| 1137 | |
| 1138 | helper = nf_conntrack_helper_try_module_get(name, info->family, |
| 1139 | key->ip.proto); |
| 1140 | if (!helper) { |
| 1141 | OVS_NLERR(log, "Unknown helper \"%s\"", name); |
| 1142 | return -EINVAL; |
| 1143 | } |
| 1144 | |
| 1145 | help = nf_ct_helper_ext_add(info->ct, helper, GFP_KERNEL); |
| 1146 | if (!help) { |
Liping Zhang | d91fc59 | 2017-05-07 22:01:55 +0800 | [diff] [blame] | 1147 | nf_conntrack_helper_put(helper); |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1148 | return -ENOMEM; |
| 1149 | } |
| 1150 | |
| 1151 | rcu_assign_pointer(help->helper, helper); |
| 1152 | info->helper = helper; |
| 1153 | return 0; |
| 1154 | } |
| 1155 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1156 | #ifdef CONFIG_NF_NAT_NEEDED |
| 1157 | static int parse_nat(const struct nlattr *attr, |
| 1158 | struct ovs_conntrack_info *info, bool log) |
| 1159 | { |
| 1160 | struct nlattr *a; |
| 1161 | int rem; |
| 1162 | bool have_ip_max = false; |
| 1163 | bool have_proto_max = false; |
| 1164 | bool ip_vers = (info->family == NFPROTO_IPV6); |
| 1165 | |
| 1166 | nla_for_each_nested(a, attr, rem) { |
| 1167 | static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = { |
| 1168 | [OVS_NAT_ATTR_SRC] = {0, 0}, |
| 1169 | [OVS_NAT_ATTR_DST] = {0, 0}, |
| 1170 | [OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr), |
| 1171 | sizeof(struct in6_addr)}, |
| 1172 | [OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr), |
| 1173 | sizeof(struct in6_addr)}, |
| 1174 | [OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)}, |
| 1175 | [OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)}, |
| 1176 | [OVS_NAT_ATTR_PERSISTENT] = {0, 0}, |
| 1177 | [OVS_NAT_ATTR_PROTO_HASH] = {0, 0}, |
| 1178 | [OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0}, |
| 1179 | }; |
| 1180 | int type = nla_type(a); |
| 1181 | |
| 1182 | if (type > OVS_NAT_ATTR_MAX) { |
Joe Perches | 0ed80da | 2017-08-11 04:26:26 -0700 | [diff] [blame^] | 1183 | OVS_NLERR(log, "Unknown NAT attribute (type=%d, max=%d)", |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1184 | type, OVS_NAT_ATTR_MAX); |
| 1185 | return -EINVAL; |
| 1186 | } |
| 1187 | |
| 1188 | if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) { |
Joe Perches | 0ed80da | 2017-08-11 04:26:26 -0700 | [diff] [blame^] | 1189 | OVS_NLERR(log, "NAT attribute type %d has unexpected length (%d != %d)", |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1190 | type, nla_len(a), |
| 1191 | ovs_nat_attr_lens[type][ip_vers]); |
| 1192 | return -EINVAL; |
| 1193 | } |
| 1194 | |
| 1195 | switch (type) { |
| 1196 | case OVS_NAT_ATTR_SRC: |
| 1197 | case OVS_NAT_ATTR_DST: |
| 1198 | if (info->nat) { |
Joe Perches | 0ed80da | 2017-08-11 04:26:26 -0700 | [diff] [blame^] | 1199 | OVS_NLERR(log, "Only one type of NAT may be specified"); |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1200 | return -ERANGE; |
| 1201 | } |
| 1202 | info->nat |= OVS_CT_NAT; |
| 1203 | info->nat |= ((type == OVS_NAT_ATTR_SRC) |
| 1204 | ? OVS_CT_SRC_NAT : OVS_CT_DST_NAT); |
| 1205 | break; |
| 1206 | |
| 1207 | case OVS_NAT_ATTR_IP_MIN: |
Haishuang Yan | ac71b46 | 2016-03-28 18:08:59 +0800 | [diff] [blame] | 1208 | nla_memcpy(&info->range.min_addr, a, |
| 1209 | sizeof(info->range.min_addr)); |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1210 | info->range.flags |= NF_NAT_RANGE_MAP_IPS; |
| 1211 | break; |
| 1212 | |
| 1213 | case OVS_NAT_ATTR_IP_MAX: |
| 1214 | have_ip_max = true; |
| 1215 | nla_memcpy(&info->range.max_addr, a, |
| 1216 | sizeof(info->range.max_addr)); |
| 1217 | info->range.flags |= NF_NAT_RANGE_MAP_IPS; |
| 1218 | break; |
| 1219 | |
| 1220 | case OVS_NAT_ATTR_PROTO_MIN: |
| 1221 | info->range.min_proto.all = htons(nla_get_u16(a)); |
| 1222 | info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; |
| 1223 | break; |
| 1224 | |
| 1225 | case OVS_NAT_ATTR_PROTO_MAX: |
| 1226 | have_proto_max = true; |
| 1227 | info->range.max_proto.all = htons(nla_get_u16(a)); |
| 1228 | info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED; |
| 1229 | break; |
| 1230 | |
| 1231 | case OVS_NAT_ATTR_PERSISTENT: |
| 1232 | info->range.flags |= NF_NAT_RANGE_PERSISTENT; |
| 1233 | break; |
| 1234 | |
| 1235 | case OVS_NAT_ATTR_PROTO_HASH: |
| 1236 | info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM; |
| 1237 | break; |
| 1238 | |
| 1239 | case OVS_NAT_ATTR_PROTO_RANDOM: |
| 1240 | info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY; |
| 1241 | break; |
| 1242 | |
| 1243 | default: |
Joe Perches | 0ed80da | 2017-08-11 04:26:26 -0700 | [diff] [blame^] | 1244 | OVS_NLERR(log, "Unknown nat attribute (%d)", type); |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1245 | return -EINVAL; |
| 1246 | } |
| 1247 | } |
| 1248 | |
| 1249 | if (rem > 0) { |
Joe Perches | 0ed80da | 2017-08-11 04:26:26 -0700 | [diff] [blame^] | 1250 | OVS_NLERR(log, "NAT attribute has %d unknown bytes", rem); |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1251 | return -EINVAL; |
| 1252 | } |
| 1253 | if (!info->nat) { |
| 1254 | /* Do not allow flags if no type is given. */ |
| 1255 | if (info->range.flags) { |
| 1256 | OVS_NLERR(log, |
| 1257 | "NAT flags may be given only when NAT range (SRC or DST) is also specified.\n" |
| 1258 | ); |
| 1259 | return -EINVAL; |
| 1260 | } |
| 1261 | info->nat = OVS_CT_NAT; /* NAT existing connections. */ |
| 1262 | } else if (!info->commit) { |
| 1263 | OVS_NLERR(log, |
| 1264 | "NAT attributes may be specified only when CT COMMIT flag is also specified.\n" |
| 1265 | ); |
| 1266 | return -EINVAL; |
| 1267 | } |
| 1268 | /* Allow missing IP_MAX. */ |
| 1269 | if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) { |
| 1270 | memcpy(&info->range.max_addr, &info->range.min_addr, |
| 1271 | sizeof(info->range.max_addr)); |
| 1272 | } |
| 1273 | /* Allow missing PROTO_MAX. */ |
| 1274 | if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED && |
| 1275 | !have_proto_max) { |
| 1276 | info->range.max_proto.all = info->range.min_proto.all; |
| 1277 | } |
| 1278 | return 0; |
| 1279 | } |
| 1280 | #endif |
| 1281 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1282 | static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = { |
Joe Stringer | ab38a7b | 2015-10-06 11:00:01 -0700 | [diff] [blame] | 1283 | [OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 }, |
Jarno Rajahalme | dd41d33 | 2017-02-09 11:22:00 -0800 | [diff] [blame] | 1284 | [OVS_CT_ATTR_FORCE_COMMIT] = { .minlen = 0, .maxlen = 0 }, |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1285 | [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16), |
| 1286 | .maxlen = sizeof(u16) }, |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 1287 | [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark), |
| 1288 | .maxlen = sizeof(struct md_mark) }, |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 1289 | [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels), |
| 1290 | .maxlen = sizeof(struct md_labels) }, |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1291 | [OVS_CT_ATTR_HELPER] = { .minlen = 1, |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1292 | .maxlen = NF_CT_HELPER_NAME_LEN }, |
| 1293 | #ifdef CONFIG_NF_NAT_NEEDED |
| 1294 | /* NAT length is checked when parsing the nested attributes. */ |
| 1295 | [OVS_CT_ATTR_NAT] = { .minlen = 0, .maxlen = INT_MAX }, |
| 1296 | #endif |
Jarno Rajahalme | 1206455 | 2017-04-21 16:48:06 -0700 | [diff] [blame] | 1297 | [OVS_CT_ATTR_EVENTMASK] = { .minlen = sizeof(u32), |
| 1298 | .maxlen = sizeof(u32) }, |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1299 | }; |
| 1300 | |
| 1301 | static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info, |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1302 | const char **helper, bool log) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1303 | { |
| 1304 | struct nlattr *a; |
| 1305 | int rem; |
| 1306 | |
| 1307 | nla_for_each_nested(a, attr, rem) { |
| 1308 | int type = nla_type(a); |
Liping Zhang | 69ec932 | 2017-07-23 17:52:23 +0800 | [diff] [blame] | 1309 | int maxlen; |
| 1310 | int minlen; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1311 | |
| 1312 | if (type > OVS_CT_ATTR_MAX) { |
| 1313 | OVS_NLERR(log, |
| 1314 | "Unknown conntrack attr (type=%d, max=%d)", |
| 1315 | type, OVS_CT_ATTR_MAX); |
| 1316 | return -EINVAL; |
| 1317 | } |
Liping Zhang | 69ec932 | 2017-07-23 17:52:23 +0800 | [diff] [blame] | 1318 | |
| 1319 | maxlen = ovs_ct_attr_lens[type].maxlen; |
| 1320 | minlen = ovs_ct_attr_lens[type].minlen; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1321 | if (nla_len(a) < minlen || nla_len(a) > maxlen) { |
| 1322 | OVS_NLERR(log, |
| 1323 | "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)", |
| 1324 | type, nla_len(a), maxlen); |
| 1325 | return -EINVAL; |
| 1326 | } |
| 1327 | |
| 1328 | switch (type) { |
Jarno Rajahalme | dd41d33 | 2017-02-09 11:22:00 -0800 | [diff] [blame] | 1329 | case OVS_CT_ATTR_FORCE_COMMIT: |
| 1330 | info->force = true; |
| 1331 | /* fall through. */ |
Joe Stringer | ab38a7b | 2015-10-06 11:00:01 -0700 | [diff] [blame] | 1332 | case OVS_CT_ATTR_COMMIT: |
| 1333 | info->commit = true; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1334 | break; |
| 1335 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 1336 | case OVS_CT_ATTR_ZONE: |
| 1337 | info->zone.id = nla_get_u16(a); |
| 1338 | break; |
| 1339 | #endif |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 1340 | #ifdef CONFIG_NF_CONNTRACK_MARK |
| 1341 | case OVS_CT_ATTR_MARK: { |
| 1342 | struct md_mark *mark = nla_data(a); |
| 1343 | |
Joe Stringer | e754ec6 | 2015-10-19 19:19:00 -0700 | [diff] [blame] | 1344 | if (!mark->mask) { |
| 1345 | OVS_NLERR(log, "ct_mark mask cannot be 0"); |
| 1346 | return -EINVAL; |
| 1347 | } |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 1348 | info->mark = *mark; |
| 1349 | break; |
| 1350 | } |
| 1351 | #endif |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1352 | #ifdef CONFIG_NF_CONNTRACK_LABELS |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 1353 | case OVS_CT_ATTR_LABELS: { |
| 1354 | struct md_labels *labels = nla_data(a); |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1355 | |
Joe Stringer | e754ec6 | 2015-10-19 19:19:00 -0700 | [diff] [blame] | 1356 | if (!labels_nonzero(&labels->mask)) { |
| 1357 | OVS_NLERR(log, "ct_labels mask cannot be 0"); |
| 1358 | return -EINVAL; |
| 1359 | } |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 1360 | info->labels = *labels; |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1361 | break; |
| 1362 | } |
| 1363 | #endif |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1364 | case OVS_CT_ATTR_HELPER: |
| 1365 | *helper = nla_data(a); |
| 1366 | if (!memchr(*helper, '\0', nla_len(a))) { |
| 1367 | OVS_NLERR(log, "Invalid conntrack helper"); |
| 1368 | return -EINVAL; |
| 1369 | } |
| 1370 | break; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1371 | #ifdef CONFIG_NF_NAT_NEEDED |
| 1372 | case OVS_CT_ATTR_NAT: { |
| 1373 | int err = parse_nat(a, info, log); |
| 1374 | |
| 1375 | if (err) |
| 1376 | return err; |
| 1377 | break; |
| 1378 | } |
| 1379 | #endif |
Jarno Rajahalme | 1206455 | 2017-04-21 16:48:06 -0700 | [diff] [blame] | 1380 | case OVS_CT_ATTR_EVENTMASK: |
| 1381 | info->have_eventmask = true; |
| 1382 | info->eventmask = nla_get_u32(a); |
| 1383 | break; |
| 1384 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1385 | default: |
| 1386 | OVS_NLERR(log, "Unknown conntrack attr (%d)", |
| 1387 | type); |
| 1388 | return -EINVAL; |
| 1389 | } |
| 1390 | } |
| 1391 | |
Jarno Rajahalme | 7d904c7 | 2016-06-21 14:59:38 -0700 | [diff] [blame] | 1392 | #ifdef CONFIG_NF_CONNTRACK_MARK |
| 1393 | if (!info->commit && info->mark.mask) { |
| 1394 | OVS_NLERR(log, |
| 1395 | "Setting conntrack mark requires 'commit' flag."); |
| 1396 | return -EINVAL; |
| 1397 | } |
| 1398 | #endif |
| 1399 | #ifdef CONFIG_NF_CONNTRACK_LABELS |
| 1400 | if (!info->commit && labels_nonzero(&info->labels.mask)) { |
| 1401 | OVS_NLERR(log, |
| 1402 | "Setting conntrack labels requires 'commit' flag."); |
| 1403 | return -EINVAL; |
| 1404 | } |
| 1405 | #endif |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1406 | if (rem > 0) { |
| 1407 | OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem); |
| 1408 | return -EINVAL; |
| 1409 | } |
| 1410 | |
| 1411 | return 0; |
| 1412 | } |
| 1413 | |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1414 | bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1415 | { |
| 1416 | if (attr == OVS_KEY_ATTR_CT_STATE) |
| 1417 | return true; |
| 1418 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && |
| 1419 | attr == OVS_KEY_ATTR_CT_ZONE) |
| 1420 | return true; |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 1421 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && |
| 1422 | attr == OVS_KEY_ATTR_CT_MARK) |
| 1423 | return true; |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1424 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 1425 | attr == OVS_KEY_ATTR_CT_LABELS) { |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1426 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
| 1427 | |
| 1428 | return ovs_net->xt_label; |
| 1429 | } |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1430 | |
| 1431 | return false; |
| 1432 | } |
| 1433 | |
| 1434 | int ovs_ct_copy_action(struct net *net, const struct nlattr *attr, |
| 1435 | const struct sw_flow_key *key, |
| 1436 | struct sw_flow_actions **sfa, bool log) |
| 1437 | { |
| 1438 | struct ovs_conntrack_info ct_info; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1439 | const char *helper = NULL; |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1440 | u16 family; |
| 1441 | int err; |
| 1442 | |
| 1443 | family = key_to_nfproto(key); |
| 1444 | if (family == NFPROTO_UNSPEC) { |
| 1445 | OVS_NLERR(log, "ct family unspecified"); |
| 1446 | return -EINVAL; |
| 1447 | } |
| 1448 | |
| 1449 | memset(&ct_info, 0, sizeof(ct_info)); |
| 1450 | ct_info.family = family; |
| 1451 | |
| 1452 | nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID, |
| 1453 | NF_CT_DEFAULT_ZONE_DIR, 0); |
| 1454 | |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1455 | err = parse_ct(attr, &ct_info, &helper, log); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1456 | if (err) |
| 1457 | return err; |
| 1458 | |
| 1459 | /* Set up template for tracking connections in specific zones. */ |
| 1460 | ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL); |
| 1461 | if (!ct_info.ct) { |
| 1462 | OVS_NLERR(log, "Failed to allocate conntrack template"); |
| 1463 | return -ENOMEM; |
| 1464 | } |
Joe Stringer | 90c7afc96 | 2015-12-23 14:39:27 -0800 | [diff] [blame] | 1465 | |
| 1466 | __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status); |
| 1467 | nf_conntrack_get(&ct_info.ct->ct_general); |
| 1468 | |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1469 | if (helper) { |
| 1470 | err = ovs_ct_add_helper(&ct_info, helper, key, log); |
| 1471 | if (err) |
| 1472 | goto err_free_ct; |
| 1473 | } |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1474 | |
| 1475 | err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info, |
| 1476 | sizeof(ct_info), log); |
| 1477 | if (err) |
| 1478 | goto err_free_ct; |
| 1479 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1480 | return 0; |
| 1481 | err_free_ct: |
Joe Stringer | 2f3ab9f | 2015-12-09 14:07:39 -0800 | [diff] [blame] | 1482 | __ovs_ct_free_action(&ct_info); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1483 | return err; |
| 1484 | } |
| 1485 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1486 | #ifdef CONFIG_NF_NAT_NEEDED |
| 1487 | static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info, |
| 1488 | struct sk_buff *skb) |
| 1489 | { |
| 1490 | struct nlattr *start; |
| 1491 | |
| 1492 | start = nla_nest_start(skb, OVS_CT_ATTR_NAT); |
| 1493 | if (!start) |
| 1494 | return false; |
| 1495 | |
| 1496 | if (info->nat & OVS_CT_SRC_NAT) { |
| 1497 | if (nla_put_flag(skb, OVS_NAT_ATTR_SRC)) |
| 1498 | return false; |
| 1499 | } else if (info->nat & OVS_CT_DST_NAT) { |
| 1500 | if (nla_put_flag(skb, OVS_NAT_ATTR_DST)) |
| 1501 | return false; |
| 1502 | } else { |
| 1503 | goto out; |
| 1504 | } |
| 1505 | |
| 1506 | if (info->range.flags & NF_NAT_RANGE_MAP_IPS) { |
Arnd Bergmann | 99b7248 | 2016-03-18 14:33:45 +0100 | [diff] [blame] | 1507 | if (IS_ENABLED(CONFIG_NF_NAT_IPV4) && |
| 1508 | info->family == NFPROTO_IPV4) { |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1509 | if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN, |
| 1510 | info->range.min_addr.ip) || |
| 1511 | (info->range.max_addr.ip |
| 1512 | != info->range.min_addr.ip && |
| 1513 | (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX, |
| 1514 | info->range.max_addr.ip)))) |
| 1515 | return false; |
Arnd Bergmann | 99b7248 | 2016-03-18 14:33:45 +0100 | [diff] [blame] | 1516 | } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) && |
| 1517 | info->family == NFPROTO_IPV6) { |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1518 | if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN, |
| 1519 | &info->range.min_addr.in6) || |
| 1520 | (memcmp(&info->range.max_addr.in6, |
| 1521 | &info->range.min_addr.in6, |
| 1522 | sizeof(info->range.max_addr.in6)) && |
| 1523 | (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX, |
| 1524 | &info->range.max_addr.in6)))) |
| 1525 | return false; |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1526 | } else { |
| 1527 | return false; |
| 1528 | } |
| 1529 | } |
| 1530 | if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED && |
| 1531 | (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN, |
| 1532 | ntohs(info->range.min_proto.all)) || |
| 1533 | (info->range.max_proto.all != info->range.min_proto.all && |
| 1534 | nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX, |
| 1535 | ntohs(info->range.max_proto.all))))) |
| 1536 | return false; |
| 1537 | |
| 1538 | if (info->range.flags & NF_NAT_RANGE_PERSISTENT && |
| 1539 | nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT)) |
| 1540 | return false; |
| 1541 | if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM && |
| 1542 | nla_put_flag(skb, OVS_NAT_ATTR_PROTO_HASH)) |
| 1543 | return false; |
| 1544 | if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY && |
| 1545 | nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM)) |
| 1546 | return false; |
| 1547 | out: |
| 1548 | nla_nest_end(skb, start); |
| 1549 | |
| 1550 | return true; |
| 1551 | } |
| 1552 | #endif |
| 1553 | |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1554 | int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info, |
| 1555 | struct sk_buff *skb) |
| 1556 | { |
| 1557 | struct nlattr *start; |
| 1558 | |
| 1559 | start = nla_nest_start(skb, OVS_ACTION_ATTR_CT); |
| 1560 | if (!start) |
| 1561 | return -EMSGSIZE; |
| 1562 | |
Jarno Rajahalme | dd41d33 | 2017-02-09 11:22:00 -0800 | [diff] [blame] | 1563 | if (ct_info->commit && nla_put_flag(skb, ct_info->force |
| 1564 | ? OVS_CT_ATTR_FORCE_COMMIT |
| 1565 | : OVS_CT_ATTR_COMMIT)) |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1566 | return -EMSGSIZE; |
| 1567 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) && |
| 1568 | nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id)) |
| 1569 | return -EMSGSIZE; |
Joe Stringer | e754ec6 | 2015-10-19 19:19:00 -0700 | [diff] [blame] | 1570 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask && |
Joe Stringer | 182e304 | 2015-08-26 11:31:49 -0700 | [diff] [blame] | 1571 | nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark), |
| 1572 | &ct_info->mark)) |
| 1573 | return -EMSGSIZE; |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1574 | if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) && |
Joe Stringer | e754ec6 | 2015-10-19 19:19:00 -0700 | [diff] [blame] | 1575 | labels_nonzero(&ct_info->labels.mask) && |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 1576 | nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels), |
| 1577 | &ct_info->labels)) |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1578 | return -EMSGSIZE; |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1579 | if (ct_info->helper) { |
| 1580 | if (nla_put_string(skb, OVS_CT_ATTR_HELPER, |
| 1581 | ct_info->helper->name)) |
| 1582 | return -EMSGSIZE; |
| 1583 | } |
Jarno Rajahalme | 1206455 | 2017-04-21 16:48:06 -0700 | [diff] [blame] | 1584 | if (ct_info->have_eventmask && |
| 1585 | nla_put_u32(skb, OVS_CT_ATTR_EVENTMASK, ct_info->eventmask)) |
| 1586 | return -EMSGSIZE; |
| 1587 | |
Jarno Rajahalme | 0575252 | 2016-03-10 10:54:23 -0800 | [diff] [blame] | 1588 | #ifdef CONFIG_NF_NAT_NEEDED |
| 1589 | if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb)) |
| 1590 | return -EMSGSIZE; |
| 1591 | #endif |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1592 | nla_nest_end(skb, start); |
| 1593 | |
| 1594 | return 0; |
| 1595 | } |
| 1596 | |
| 1597 | void ovs_ct_free_action(const struct nlattr *a) |
| 1598 | { |
| 1599 | struct ovs_conntrack_info *ct_info = nla_data(a); |
| 1600 | |
Joe Stringer | 2f3ab9f | 2015-12-09 14:07:39 -0800 | [diff] [blame] | 1601 | __ovs_ct_free_action(ct_info); |
| 1602 | } |
| 1603 | |
| 1604 | static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info) |
| 1605 | { |
Joe Stringer | cae3a26 | 2015-08-26 11:31:53 -0700 | [diff] [blame] | 1606 | if (ct_info->helper) |
Liping Zhang | d91fc59 | 2017-05-07 22:01:55 +0800 | [diff] [blame] | 1607 | nf_conntrack_helper_put(ct_info->helper); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1608 | if (ct_info->ct) |
Joe Stringer | 7664423 | 2016-09-01 18:01:47 -0700 | [diff] [blame] | 1609 | nf_ct_tmpl_free(ct_info->ct); |
Joe Stringer | 7f8a436 | 2015-08-26 11:31:48 -0700 | [diff] [blame] | 1610 | } |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1611 | |
| 1612 | void ovs_ct_init(struct net *net) |
| 1613 | { |
Joe Stringer | 33db412 | 2015-10-01 15:00:37 -0700 | [diff] [blame] | 1614 | unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE; |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1615 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
| 1616 | |
Florian Westphal | adff6c6 | 2016-04-12 18:14:25 +0200 | [diff] [blame] | 1617 | if (nf_connlabels_get(net, n_bits - 1)) { |
Joe Stringer | c2ac667 | 2015-08-26 11:31:52 -0700 | [diff] [blame] | 1618 | ovs_net->xt_label = false; |
| 1619 | OVS_NLERR(true, "Failed to set connlabel length"); |
| 1620 | } else { |
| 1621 | ovs_net->xt_label = true; |
| 1622 | } |
| 1623 | } |
| 1624 | |
| 1625 | void ovs_ct_exit(struct net *net) |
| 1626 | { |
| 1627 | struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
| 1628 | |
| 1629 | if (ovs_net->xt_label) |
| 1630 | nf_connlabels_put(net); |
| 1631 | } |